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Ancient Galactic Globular Clusters (GCs) have long fascinated astronomers dueto their intriguing multiple stellar populations characterized by variations inlight-element abundances. Among these clusters, Type-II GCs stand out as theyexhibit stars with large differences in heavy-element chemical abundances.These enigmatic clusters, comprising approximately 17\% of analyzed GCs withMPs, have been hypothesized to be the remnants of accreted dwarf galaxies. Wefocus on one of the most debated Type~II GCs, NGC1851, to investigate its MPsacross a wide spatial range of up to 50 arcmin from the cluster center. Byusing Gaia DR3 low-resolution XP spectra, we generate synthetic photometry toperform a comprehensive analysis of the spatial distribution and kinematics ofthe canonical and anomalous populations within this GC. By using appropriateCMDs from the synthetic photometry in the BVI bands and in the $\rm f415^{25}$band introduced in this work, we identify distinct stellar sequences associatedwith different heavy-element chemical composition. Our results suggest that thecanonical and the anomalous populations reside both inside and outside thetidal radius of NGC1851, up to a distance that exceeds by 3.5 times its tidalradius. However, $\sim$80\% of stars outside the tidal radius are consistentwith belonging to the canonical population, emphasizing its dominance in thecluster's outer regions. Remarkably, canonical stars exhibit a more circularon-sky morphology, while the anomalous population displays an elliptical shape.Furthermore, we delve into the kinematics of the multiple populations. Ourresults reveal a flat/increasing velocity dispersion profile in the outerregions and hints of a tangentially anisotropic motion in the outer regions,indicating a preference for stars to escape on radial orbits.

Multiple Stellar Populations outside the tidal radius of NGC1851 through Gaia DR3 XP Spectra